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Make sure you have correct driver installed properly. It dpends on the Operating System you are using as well. Like in Vista or Windows 7 you are likely to get some webcam drivers preloaded, whereas in XP you may or may not see the usb video device in the my computer panel. Also, if your webcam requires some special other applications to use it then check with your vendor to provide the same.

Try do uninstall all Webcam specific applications(Like YouCam), and close all webcam enabled application(like Live Messenger).sometimes they conflict with skype.install latest drivers for your webcam if you don't have them alreadyGo in the skype settings and set up your webcam.Now you should be good.